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Kernel/PCI: Break early of controller iteration over devices in OOM case

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This is mainly useful when adding an HostController but due to OOM
condition, we abort temporary Vector insertion of a DeviceIdentifier
and then exit the iteration loop to report back the error if occured.
This commit is contained in:
Liav A 2022-02-04 22:11:50 +02:00 committed by Andreas Kling
parent 3fb289e27d
commit 428d4ae337
Notes: sideshowbarker 2024-07-17 17:25:59 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/428d4ae337
Pull-request: https://github.com/SerenityOS/serenity/pull/12282
Reviewed-by: https://github.com/awesomekling
5 changed files with 18 additions and 13 deletions
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10
Kernel/Bus/PCI/Access.cpp
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@ -133,11 +133,14 @@ ErrorOr<void> Access::add_host_controller_and_enumerate_attached_devices(Nonnull
// definitely before enumerating devices behing that.
m_host_controllers.set(domain_number, move(controller));
ErrorOr<void> expansion_result;
m_host_controllers.get(domain_number).value()->enumerate_attached_devices([&](DeviceIdentifier const& device_identifier) -> void {
m_host_controllers.get(domain_number).value()->enumerate_attached_devices([&](DeviceIdentifier const& device_identifier) -> IterationDecision {
m_device_identifiers.append(device_identifier);
auto result = device_identifiers_behind_host_controller.try_append(device_identifier);
if (result.is_error())
if (result.is_error()) {
expansion_result = result;
return IterationDecision::Break;
}
return IterationDecision::Continue;
});
if (expansion_result.is_error())
return expansion_result;
@ -166,8 +169,9 @@ UNMAP_AFTER_INIT void Access::rescan_hardware()
SpinlockLocker scan_locker(m_scan_lock);
VERIFY(m_device_identifiers.is_empty());
for (auto it = m_host_controllers.begin(); it != m_host_controllers.end(); ++it) {
(*it).value->enumerate_attached_devices([this](DeviceIdentifier device_identifier) -> void {
(*it).value->enumerate_attached_devices([this](DeviceIdentifier device_identifier) -> IterationDecision {
m_device_identifiers.append(device_identifier);
return IterationDecision::Continue;
});
}
}

8
Kernel/Bus/PCI/Controller/HostBridge.cpp
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@ -50,7 +50,7 @@ UNMAP_AFTER_INIT Vector<Capability> HostBridge::get_capabilities_for_function(Bu
return capabilities;
}
UNMAP_AFTER_INIT void HostBridge::enumerate_functions(Function<void(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, FunctionNumber function, bool recursive_search_into_bridges)
UNMAP_AFTER_INIT void HostBridge::enumerate_functions(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, FunctionNumber function, bool recursive_search_into_bridges)
{
dbgln_if(PCI_DEBUG, "PCI: Enumerating function, bus={}, device={}, function={}", bus, device, function);
Address address(domain_number(), bus.value(), device.value(), function.value());
@ -79,7 +79,7 @@ UNMAP_AFTER_INIT void HostBridge::enumerate_functions(Function<void(DeviceIdenti
}
}
UNMAP_AFTER_INIT void HostBridge::enumerate_device(Function<void(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, bool recursive_search_into_bridges)
UNMAP_AFTER_INIT void HostBridge::enumerate_device(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, bool recursive_search_into_bridges)
{
dbgln_if(PCI_DEBUG, "PCI: Enumerating device in bus={}, device={}", bus, device);
if (read16_field(bus, device, 0, PCI::RegisterOffset::VENDOR_ID) == PCI::none_value)
@ -93,14 +93,14 @@ UNMAP_AFTER_INIT void HostBridge::enumerate_device(Function<void(DeviceIdentifie
}
}
UNMAP_AFTER_INIT void HostBridge::enumerate_bus(Function<void(DeviceIdentifier)> const& callback, BusNumber bus, bool recursive_search_into_bridges)
UNMAP_AFTER_INIT void HostBridge::enumerate_bus(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber bus, bool recursive_search_into_bridges)
{
dbgln_if(PCI_DEBUG, "PCI: Enumerating bus {}", bus);
for (u8 device = 0; device < 32; ++device)
enumerate_device(callback, bus, device, recursive_search_into_bridges);
}
UNMAP_AFTER_INIT void HostBridge::enumerate_attached_devices(Function<void(DeviceIdentifier)> callback)
UNMAP_AFTER_INIT void HostBridge::enumerate_attached_devices(Function<IterationDecision(DeviceIdentifier)> callback)
{
VERIFY(Access::the().access_lock().is_locked());
VERIFY(Access::the().scan_lock().is_locked());

8
Kernel/Bus/PCI/Controller/HostBridge.h
View File

@ -31,7 +31,7 @@ protected:
explicit HostBridge(PCI::Domain const&);
private:
virtual void enumerate_attached_devices(Function<void(DeviceIdentifier)> callback) override;
virtual void enumerate_attached_devices(Function<IterationDecision(DeviceIdentifier)> callback) override;
Bitmap m_enumerated_buses;
@ -41,9 +41,9 @@ private:
Optional<u8> get_capabilities_pointer_for_function(BusNumber, DeviceNumber, FunctionNumber);
Vector<Capability> get_capabilities_for_function(BusNumber, DeviceNumber, FunctionNumber);
void enumerate_bus(Function<void(DeviceIdentifier)> const& callback, BusNumber, bool recursive);
void enumerate_functions(Function<void(DeviceIdentifier)> const& callback, BusNumber, DeviceNumber, FunctionNumber, bool recursive);
void enumerate_device(Function<void(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, bool recursive);
void enumerate_bus(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber, bool recursive);
void enumerate_functions(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber, DeviceNumber, FunctionNumber, bool recursive);
void enumerate_device(Function<IterationDecision(DeviceIdentifier)> const& callback, BusNumber bus, DeviceNumber device, bool recursive);
};
}

2
Kernel/Bus/PCI/Controller/HostController.h
View File

@ -31,7 +31,7 @@ public:
u32 domain_number() const { return m_domain.domain_number(); }
virtual void enumerate_attached_devices(Function<void(DeviceIdentifier)> callback) = 0;
virtual void enumerate_attached_devices(Function<IterationDecision(DeviceIdentifier)> callback) = 0;
protected:
explicit HostController(PCI::Domain const& domain)

3
Kernel/Storage/StorageManagement.cpp
View File

@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/IterationDecision.h>
#include <AK/Singleton.h>
#include <AK/StringView.h>
#include <AK/UUID.h>
@ -53,7 +54,7 @@ UNMAP_AFTER_INIT void StorageManagement::enumerate_pci_controllers(bool force_pi
using SubclassID = PCI::MassStorage::SubclassID;
if (!kernel_command_line().disable_physical_storage()) {
MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
MUST(PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) -> void {
if (device_identifier.class_code().value() != to_underlying(PCI::ClassID::MassStorage)) {
return;
}